Atomic Structure Worksheet: Editable template | airSlate SignNow - Free Printable

It looks like you've uploaded a worksheet titled "Atomic Mass and Atomic Number Worksheet" that includes a table with information about various elements, such as their name, symbol, atomic number, atomic mass, protons, neutrons, and electrons. However, the actual image or diagram referenced in the instructions at the bottom of the worksheet is missing from your upload.

The instruction at the bottom says:

> "If the diagram above were to be cut into the elements, # of neutrons, # of protons, # of electrons, Atomic Number, or Atomic Mass/Weight for each of the elements below. Use your Periodic Table on the Mar. 201 HW page to help you with determining what will go in the blanks."

Since I can't see the diagram, I can’t determine how it's structured or which specific parts need to be filled in. But I can help you solve the worksheet based on the table provided, assuming the goal is to fill in missing values using the periodic table.

Let’s go through the table and complete any missing data using known chemistry principles:

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🔍 Key Concepts:

- Atomic Number (Z) = Number of protons
- Number of Electrons = Number of protons (in neutral atoms)
- Atomic Mass (A) ≈ Protons + Neutrons → So:
Neutrons = Atomic Mass – Atomic Number

We'll use this to fill in any blanks.

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✔ Let's Complete the Table

| Name | Symbol | Atomic Number | Atomic Mass | Protons | Neutrons | Electrons |
|------------|--------|---------------|-------------|---------|----------|-----------|
| Copper | Cu | 29 | 63 | 29 | 34 | 29 |
| Tin | Sn | 50 | 118.7 | 50 | 69 | 50 |
| Uranium | U | 92 | 238 | 92 | 146 | 92 |
| Lithium | Li | 3 | 7 | 3 | 4 | 3 |
| Oxygen | O | 8 | 16 | 8 | 8 | 8 |
| Gold | Au | 79 | 197 | 79 | 118 | 79 |
| Silver | Ag | 47 | 108 | 47 | 61 | 47 |
| Chromium | Cr | 24 | 52 | 24 | 28 | 24 |
| Zinc | Zn | 30 | 65 | 30 | 35 | 30 |
| Platinum | Pt | 78 | 195 | 78 | 117 | 78 |
| Hydrogen | H | 1 | 1 | 1 | 0 | 1 |
| Helium | He | 2 | 4 | 2 | 2 | 2 |
| Magnesium | Mg | 12 | 24 | 12 | 12 | 12 |
| Silicon | Si | 14 | 28 | 14 | 14 | 14 |
| Boron | B | 5 | 11 | 5 | 6 | 5 |
| Calcium | Ca | 20 | 40 | 20 | 20 | 20 |
| Lead | Pb | 82 | 207 | 82 | 125 | 82 |
| Sodium | Na | 11 | 23 | 11 | 12 | 11 |
| Phosphorus | P | 15 | 31 | 15 | 16 | 15 |

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🔎 Corrections & Explanations:

#### 1. Copper (Cu)
- Atomic Mass: ~63.5, but here it's listed as 63 → acceptable for rounding.
- Neutrons = 63 - 29 = 34

#### 2. Tin (Sn)
- Atomic Mass: 118.7 → average due to isotopes
- Neutrons ≈ 118.7 - 50 = 68.7 → round to 69 (commonly accepted)

#### 3. Uranium (U)
- Atomic Mass: 238 → common isotope U-238
- Neutrons = 238 - 92 = 146

#### 4. Lithium (Li)
- Atomic Mass: 7 → most common isotope Li-7
- Neutrons = 7 - 3 = 4

#### 5. Oxygen (O)
- Atomic Mass: 16 → O-16 isotope
- Neutrons = 16 - 8 = 8

#### 6. Gold (Au)
- Atomic Mass: 197 → Au-197
- Neutrons = 197 - 79 = 118

#### 7. Silver (Ag)
- Atomic Mass: 108 → average (Ag has isotopes)
- Neutrons ≈ 108 - 47 = 61

#### 8. Chromium (Cr)
- Atomic Mass: 52 → Cr-52
- Neutrons = 52 - 24 = 28

#### 9. Zinc (Zn)
- Atomic Mass: 65 → average (Zn has multiple isotopes)
- Neutrons ≈ 65 - 30 = 35

#### 10. Platinum (Pt)
- Atomic Mass: 195 → Pt-195
- Neutrons = 195 - 78 = 117

#### 11. Hydrogen (H)
- Atomic Mass: 1 → H-1
- Neutrons = 1 - 1 = 0

#### 12. Helium (He)
- Atomic Mass: 4 → He-4
- Neutrons = 4 - 2 = 2

#### 13. Magnesium (Mg)
- Atomic Mass: 24 → Mg-24
- Neutrons = 24 - 12 = 12

#### 14. Silicon (Si)
- Atomic Mass: 28 → Si-28
- Neutrons = 28 - 14 = 14

#### 15. Boron (B)
- Atomic Mass: 11 → B-11
- Neutrons = 11 - 5 = 6

#### 16. Calcium (Ca)
- Atomic Mass: 40 → Ca-40
- Neutrons = 40 - 20 = 20

#### 17. Lead (Pb)
- Atomic Mass: 207 → Pb-207
- Neutrons = 207 - 82 = 125

#### 18. Sodium (Na)
- Atomic Mass: 23 → Na-23
- Neutrons = 23 - 11 = 12

#### 19. Phosphorus (P)
- Atomic Mass: 31 → P-31
- Neutrons = 31 - 15 = 16

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✔ Final Notes:

- All electrons are equal to protons in neutral atoms.
- The atomic mass is usually the weighted average of isotopes, so we use the value given or standard rounded values.
- You may have been asked to cut out a diagram (like a puzzle or chart) and match each element’s properties. Since the image isn't visible, I can’t help with that part directly.

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📌 How to Use This for Your Worksheet:

1. Fill in any blanks using the formulas:
- Neutrons = Atomic Mass – Atomic Number
- Electrons = Protons = Atomic Number
2. If the diagram was a visual puzzle (e.g., labeled boxes), assign each element’s info to the correct box.
3. Use a periodic table to verify atomic numbers and masses.

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✔ If you can describe the diagram (e.g., “it’s a grid with 10 boxes, each labeled with an element symbol”), I can help reconstruct how to fill it in.

Let me know if you'd like a printable version or help with a specific section!